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我在使用 var_dump 转储 DOMDocument 对象时遇到问题。例如：

$DOMDocumentNode = new DOMDocument();
$DOMDocumentNode->loadXML('<example a="b">Test</example>');
$DOMElementNode = $DOMDocumentNode->documentElement;
$DOMAttributeNode = $DOMElementNode->getAttributeNode('a');
$DOMTextNode = $DOMElementNode->firstChild;

error_reporting(0);
var_dump($DOMDocumentNode, $DOMElementNode, $DOMAttributeNode, $DOMTextNode);

结果是：

object(DOMDocument)[1]

object(DOMElement)[2]

object(DOMAttr)[3]

object(DOMText)[4]

我的环境是（我通常通过 PHPStorm 工作）：

Linux version 3.5.0-32-generic (buildd@lamiak) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #53~precise1-Ubuntu SMP Wed May 29 20:35:31 UTC 2013

Distributor ID: Ubuntu
Description:    Ubuntu 12.04.2 LTS
Release:    12.04
Codename:   precise

PHP 5.4.15-1~precise+1 (cli) (built: May 12 2013 16:02:23) 
Copyright (c) 1997-2013 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2013 Zend Technologies
with Xdebug v2.2.1, Copyright (c) 2002-2012, by Derick Rethans

我已经进行了广泛的检查，但谷歌上的答案似乎都没有帮助。我检查了http://bugs.xdebug.org/view.php?id=913并从 https://github.com/xdebug/xdebug/blob/master/tests/bug00913.phpt运行附加测试。我来的最近的事情是完全不同的 Debug a DOMDocument Object in PHP

结果是：

FAILURES!
Tests: 1, Assertions: 1, Failures: 1.

我做错了什么？

编辑：根据要求，xdebug 上的 phpinfo()

Directive   Local Value Master Value
xdebug.auto_trace   Off Off
xdebug.cli_color    0   0
xdebug.collect_assignments  Off Off
xdebug.collect_includes On  On
xdebug.collect_params   0   0
xdebug.collect_return   Off Off
xdebug.collect_vars Off Off
xdebug.coverage_enable  On  On
xdebug.default_enable   On  On
xdebug.dump.COOKIE  no value    no value
xdebug.dump.ENV no value    no value
xdebug.dump.FILES   no value    no value
xdebug.dump.GET no value    no value
xdebug.dump.POST    no value    no value
xdebug.dump.REQUEST no value    no value
xdebug.dump.SERVER  no value    no value
xdebug.dump.SESSION no value    no value
xdebug.dump_globals On  On
xdebug.dump_once    On  On
xdebug.dump_undefined   Off Off
xdebug.extended_info    On  On
xdebug.file_link_format no value    no value
xdebug.idekey   no value    no value
xdebug.max_nesting_level    100 100
xdebug.overload_var_dump    On  On
xdebug.profiler_aggregate   Off Off
xdebug.profiler_append  Off Off
xdebug.profiler_enable  Off Off
xdebug.profiler_enable_trigger  Off Off
xdebug.profiler_output_dir  /tmp    /tmp
xdebug.profiler_output_name cachegrind.out.%p   cachegrind.out.%p
xdebug.remote_autostart Off Off
xdebug.remote_connect_back  Off Off
xdebug.remote_cookie_expire_time    3600    3600
xdebug.remote_enable    Off Off
xdebug.remote_handler   dbgp    dbgp
xdebug.remote_host  localhost   localhost
xdebug.remote_log   no value    no value
xdebug.remote_mode  req req
xdebug.remote_port  9000    9000
xdebug.scream   Off Off
xdebug.show_exception_trace Off Off
xdebug.show_local_vars  Off Off
xdebug.show_mem_delta   Off Off
xdebug.trace_enable_trigger Off Off
xdebug.trace_format 0   0
xdebug.trace_options    0   0
xdebug.trace_output_dir /tmp    /tmp
xdebug.trace_output_name    trace.%c    trace.%c
xdebug.var_display_max_children 128 128
xdebug.var_display_max_data 512 512
xdebug.var_display_max_depth    3   3
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